Linear Actuator Using SR Motor & SiC

The proposed high thrust linear actuator has three innovative elements. The first is the use of a switched reluctance motor, which is the most rugged and fault tolerant of all motor types. The second is the use of power electronics with SiC power semiconductors, which are rugged, have much better performance than standard silicon, and enable a dramatic size reduction. The third is a highly efficient lead screw with rollers rather than standard ball bearings. This mechanism gives the necessary mechanical advantage and is an order of magnitude more durable than alternative lead screws. In the optional work, the power electronics will actually be incorporated into the motor, which is an opportunity enabled by exploiting the high temperature capability of SiC. The net result is a reliable, rugged and low maintenance linear actuator system that is self contained. Most components are modularized to permit widespread replacement of hydraulic actuators with little application-specific design work.